Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
What's the name for the scientific study of bodies of fresh water?
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A starfish has how many arms?
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Which of the following is a unique characteristic of minke whales?
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What is the highest speeds dolphins have been known to attain?
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How old was the Captain of the Titanic when it went down?
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In what year did Alfred Wegner publish "The Origin of Continents and Oceans"?
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Unlike most rivers, which direction do rivers in China generally flow?
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Which of these ocean activities provides food?
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